Effectively protecting super-speed interfaces against EMI
The challenge of guarding USB and HDMI interfaces against EMI is accompanied by the need to protect them (and the systems they are connected to) against potential ESD strikes. Power delivery capability and reversible plugs in USB Type-C connectors are additional obstacles for USB interfaces. Most solutions currently employ separate devices to address each individual need, but Nexperia offers an alternative integrated approach combining CMF+ESD protection in one chip, such as the new PCMF series. Integrating CMF and ESD protection into a single device reduces overall PCB mounting space requirements. It also prevents additional impedance mismatches in the signal traces, which can occur when using separate parts. PCMF solutions from Nexperia deliver optimal robustness and low clamping while also filtering EMI that could interfere with both 2.4 GHz and 5 GHz channels. These effective two-in-one solutions are helpful for designers who prefer to choose whether an EMI filter is needed at a later stage of the design process. Our PCMF types are footprint-compatible with several PESD types for ESD-only protection, so the ESD-only and PCMF solutions can be realized on the same PCB layout. This way any unused CMF footprints don’t need to be bridged with resistors as required
in conventional designs, further simplifying overall design and assembly.
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